Ventilating apparatus



Iii

UNITED STATES PATENT OFFICE.

GEORGE B. CLARKE, OF LEONARDSVILLE, NEV YORK.

VENTILATING APPARATUS.

Specification of Letters Patent No. 27,204, dated February `21, 1860.

vTo all whom it may concern:

`State ot New York, have invented a new and Improved VentilatiinT Apparatus; and I do hereby declare that the following is a t'nll, clear, and exact description of the same, reference being had to the accompanying drawings, forming `a part of this specification, in which- Figure l. is a horizontal section of my iiivention. Fig. 2 is a vertical longitudinal section of the same, the line ai, zc, Fig. l. indicating the plane of section. Fig. 3 is a t'ront elevation ot' the same.

Similar' letters of reference in the three views indicate corresponding parts.

This invention consists in combining with a damper and air valve a slotted cross bar, which moves on a peculiarly shaped guide bracket and the motion ot which is controlled by the expansion and contraction of a twisted wire that is attached to the stove pipe in such a manner that the position of the air valve and ot the damper, regulates itself according to the heat ot the stove pipe.

To enable those skilled in the art to make and use my invention I will proceed to describe it.

A represents the chimney of a room to which the smoke from a stove B, is conducted by a pipe C. This pipe terminates in a plate D, which is set into the front of the chimney and secured to this plate is the chamber E the rear plate L of which may be cast with the plate D, or it may be other wise rigidly attached to the same, andby giving to the rear plate a an inclined position the chamber E, enlarges toward the top as clearly shown in Fig. 2.

The chamber E is divided by a partition ZJ into the compartments c, CZ, and the compartiiient o communicates with the stove pipe C, whereas the compartment (Z by means of openings c, (see Fig. 3) in the front plate, communicates with the open air.

The compartment c contains the damper f which turns on a pivot g, so that it can be made to close the mouth of the stove pipe C and it connects by a rod 7L, with a vibrating lever F, the fulcruin of which is on a pivot i at the under side of the stove pipe.

The air valve j, turns on a pivot in the compartment. Z iii such a manner that it closes the openings e in the front plate or that it opens the same when thrown back,

as will be presently explained. A rod l connects the air valve j vwith the vibrating lever F, and it will be noticed that the point at which this rod connects with the lever, is farther from the fulcrum of said lever than the point ot' connection of the rod h so as to give the air valve a quicker motion than to the damper and to allow at all times sutli cient room to the smoke to find its way to the chimney. At the same timelthe rod L connects with the damper below the pivot g, on which said damper swings, whereas the rod Z connects with the air valve y', above the pivot 7c, on which it turns, so that by the same motion of the lever F, the damper and the air valve move in opposite directions that is to say, one opens when the other closes and vice-versa.

In order to regulate the position of the damper and of the air valve according to the temperature in the room a twisted wire or rod G is soldered or otherwise firmly secured to the stove pipe. This rod terms two prongs m, m, on its upper end and attached to these prongs is the slotted cross bar H which connects by means of a rod or rods n with the vibrating lever F. A guide bracket 0, that passes through the slot 79, in the cross bar H, controls the position of the latter, which in its normal position is parallel or nearly so with the front side of the chimney. The shape of the guide bracket o is such that the cross bar H is turned as it moves up on the same, and by this motion the vibrating lever is turned on its pivot and the damper f, closes while at the same time the air valve j, opens.

The twisted wire or rod Gr, ought to be made ot such a metal, the expansion of which exceeds that of sheet-iron and the guide bracket o, the cross bar 'H and the vibrating lever F are .so adjusted that a slight increase in the length of the twisted rod G causes a perceptible motion of the damper and air valve, and so that at a certain temperature the damper f is closed and the aii valve y', is thrown wide open.

Instead of arranging the damper and the air valve in the same chamber E they may be constructed as indicated in Fig. 3 where per- -forated disks f, and y, take the places of the rectangular swinging damper f, and air valvey y'. These disks rotate on plates with openings to correspond to the apertures in the disks and they are controlled by a slotted cross bar H, which moves on a guide o and the motion of which is 'regulated by a twisted rod G. As the cross bar H, slides on the guide o one of the disks is closed and the other is opened.

If one heater serves to heat several rooms, the air valves in all the rooms may be connected to the same slotted cross bar, so that when the temperature reaches a certain point, all the rooms are ventilated and that the heat is not allowed to become oppressive.

Both the air valve and the damper may be unhooked from the vibrating lever F, so that each one can be operated separately, when a combined movement is not required and the motion of the damper and of the valve ,may also be controlled by springs.

The operation of the air valve is combined with that of the damper, in my apparatus, so that the cool and comparatively pure air GEO. B. CLARKE.

Witnesses:

GEO. J. CRANDALL, JOHN B. CRANDALL. 

